Your GY6's stock camshaft is engineered for low-RPM smoothness — not power. The SSP-G A12 Performance Camshaft changes that. With higher lift and longer duration than the stock cam, the A12 holds the intake and exhaust valves open longer and pushes them further, allowing more air and fuel into the cylinder on each stroke. The result is a noticeable increase in mid-range and top-end power, a stronger pull at higher RPMs, and a more aggressive throttle response throughout the rev range.

The A12 is one of the most popular cam upgrades for GY6 builds because it delivers real, seat-of-the-pants power gains without requiring head machining or exotic valve springs. It pairs especially well with a big bore kit, performance exhaust, and an upjetted carburetor.

Camshaft Reference Chart

SSP-G cams are marked with letter codes. Cross-reference below if your cam is labeled with the alternate "H" designation:

SSP-G Code	Alternate Code	Aggressiveness
A8	HA	Mild
A9	HB	?
A10	HC	?
A11	HD	?
A12	HE	This cam — strong mid/top-end
A13	HF	?
A14	HG	Most aggressive

Specifications

• Cam Code: A12 (HE)
• Intake Lobe Diameter: 27mm
• Exhaust Lobe Diameter: 27.20mm
• Cam Gear Teeth: 34
• Cam Bearing: 16002C3
• Compatible Engine: GY6 QMI/QMJ 152/157 (125cc/150cc 4-stroke)
• Made in Taiwan by SSP-G

Build Tip: Running a high-lift cam on a stock head with stock jetting will limit your gains and cause a lean condition at high RPM. Make sure you upjet your carburetor main jet and do frequent plug checks to ensure you have added enough fuel to get to the proper air-fuel ratio. This will ensure maximum power and longevity from your engine. The A12 works even better when paired with a performance head (larger valves), and a big bore cylinder.